Improved power-hammer



T. T. PROSSER. POWER HAMMER.

No. 88,980! Patented Apr. 18, 1869.

TREAT T. PROSSER, OF CHCF'GO, ILLINOIS. Letters Patent No. 88,980, datedApril 13, 1869.

IIEPRO'VED POWER-HAJMME The Schedule referred to 1n theseLettenPatenrand makinpart Tthe same.

To-all whom'. fit/m14] com-em:

Be it known Athat I, TREAT T. Pnossnr., of the city of Chicago, in thecounty of Cook, and State of Illinois, have invented a new Mode ofConstructing and Operating Power-Hammers; and I do hereby declare thatthe following is a full and exact description thereof', reference beinghad to the accompanying drawings, and tothe letters of reference markedthereon, and the drawing making a part of this specification.

Figure 1 is a. side elevation of my improved power# hammer.

Figure 42 is a top view of the same.

Figure 3 is a vertical longitudinal section on line y y of iig. 4.

Figure 4 is a horizontal section on line :tx of fig. 1.

Figure 5 is a horizontal -section on line zz of fig. 1.

The same letters of reference, where they occur in the drawings, .denoteidentical parts.

My invention relates to that class of machines known as power-hammers,and consists in a combination and arrangement of devices for'communicatingthe power to the hammer; also, in the arrangement forhanging, operating, and controllingthe hammer, and the changing of thehammer-dies, both in the hammerfhead and in the anvil; also, in the modeof constructing the frame, and of attaching the working-parts thereto.

To enable others skilled Ain the art to make and use my invention,`Iwill proceed to describe its construction and operation.

In order to obtain the greatest durability and economy, I construct theframe in the manner shown in iig. 1. A A are two cross-pieces, or sills,which form v the base of the machine-frame.

B B, in the same figure, are two posts, which are both tenoned on thelower end, and are inserted into a mortise in the-centrepof the sills,so as to occupy an upright position, and to be in place to receive thebalance of the timbers composing the frame.

'.Bolted on to each side of the posts B B are two longitudinal pieces, OC, forming the side timbers to the frame.

It will be seen that I construct the rear post longer than the frontone, so as to receive the cap,or crosspiece D, on its upper end. By thusarranging the frame, it will be seen that all parts are in position toreceive the ,working-parts of the machine, andform a durable and mostperfect arrangement therefor.

On the upper end of the front post, and attached thereto, is` myanvil-block F, containing the die E, which, it will be seen, is'madeadjustable, 'and is easily removed.-

Upon the upper and lower side of each end of the cap, or cross-piece D,are fulcrum, or pivot-boxes G G G G, to VAreceive the pivots H H,passing through the vibrating arms I and I, which are connected togetherand held in position by the springs .Il J and boltsKKKK.

Itwill be seen that the arms I I are in pairs, and

that the lower pair of armsi's shorter than 'the upper pair. And it willb e also seen that the arms'are in each pair much further apart at therear end than at the other, or front end; and also, that the rear endsof each pair are not connected, whilst the front ends are.

The lower pair of arms is connected at the front end by a noddle p'in,l, and thevbolts m.

In the middle of the noddle-pin l is a box, n, to which the pitman oreccentricrods are attached that vibrate the arms I' and I, by means ofthe eccentric O, ori the shait P, which is connected to the short arm ofthe levers q q, wbichlevers are pivoted at R, and, as 'the eccentric isdriven by the friction-wheels Srs S S,it will 'be evident that, as thefoot `is placed on the footboard-T, the shaft P will be 'caused tovibrate, and to bring the wheels in contact with those driven by thebelt u, and as the pressure of the foot on the foot-board T causes anincrease of friction, the vibrations are caused to correspond therewith,and as the hammer is moved up and down by these vibrations, it willbeevi-- dent that the faster the vibrations `are the 'harder the hammerwill strike, and the slower they are the lighter blow the hammer willstrike. And asthese motions are under the control of the operator, bymeans of the footboard Tand lever q, the machine can be make to strike justsuch a blow as the operator may desire.

It will be seen that the 4upper pair of arms is longer thanthe lowerarms, and their front ends are permanently attached together by means oftwo plates, u u, through which the hammer-shank passes, and to which itis attached, bym ans of the nut,.V, on the upper end of the hammer-shak. p

The hammer-shank, near the hammer W, is square, and thc hole in theplate, on the under side of the arms, through which it passes, made tocorrespond therewith, whilst the hole in the upper plate is or may beround.

The object of making the hole in the lower plate square, and the hammerto correspond, is to prevent the hammer turning when in use.

By connecting the lower arms to the upper arms, by means of the springs,it will be evident that the inertia of the hammer, when at rest, and therecoil, when at work, are overcome iny such a manner as to relieve themachine from those violent shocks incident to the common tilt-hammer,and to convert them into useful effect; for as the hammer is thrown upby its momentum to a greater distance than the movement ofthe eccentric,an increased amount of tension is imparted to the forward springs, andwhen the' hammer descends, the increased tension causes it to descendwith an increased velocity and additional force, thus being enabled tostrike a much quicker and harder blow than can be done by the machinesnow in use. And as the springs admit of a ready adjustment', by means ofthe bolts and nuts, it can be readily adj usted to a rapid or slowmotion, as desired. And as the'shock consequent on a vibrating motioncaused by a reverse movement is all-taken up'by the springs, its motionsare all easy, and cannot fail to be durable, the importance of whichmust be evident to all who are acquainted with the vast amount of laborperformed by this cin-ss of ma.- chines.

Having thus described my invention,l

What I claim, and desire to secure by Letters Perf ent, is Y v 1.The'combination and arrangement. of the two pairs of arms, l I', springsJ, and hammer W, with the fulcrum D, or it-s equivalent, substantiallyes shown and described, as a consequence of which arrangement thevhammer is carried from the anvil by one pair of the springs, andreturned thereto by means of the other pair.

2. In ycombina-tion Wi'fh the vibrating arms of a power-hammer, theeccentric O, with its connectingstraps and rods, the friction-wheels SS, and levers q q, for the purpose of regulating the blows of the hammerW, substantially in the manner described and shown.

' TREAT LYPROSSER.A

Witnesses:

- HENRY WALLER, Jr.,

R. N. EAGLE.

